Effect of earthworm casts on protein synthesis in radish (Raphanus sativum) and lettuce (Lactuga sativa) seedlings     

U. Tomati  E. Galli  A. Grappelli  G. Di Lena 《Biology and Fertility of Soils》1990,9(4):288-289

Summary The protein-synthesizing capacity of 3-day-old seedlings of radish and lettuce grown in the presence of earthworm casts was investigated using L-¹⁴-C-leucine incorporation. The results showed that earthworm casts increased protein synthesis by 24% for lettuce and 32% for radish, althought no significant differences in protein content were evident.  相似文献   

两种浓度营养液下水培生菜和小白菜生长特性及品质研究   总被引：1，自引：0，他引：1  

任尚杰  方伟  张国敏  张余洋 《作物杂志》2011,(3):42-46

比较了2个生菜品种和2个小白菜品种在两种浓度(0.5剂量、1.0剂量)营养液中水培的叶片数、叶部横径、株高、叶绿素含量、根系、单株鲜重、Vc含量和硝酸盐积累等生长特性和品质指标。结果表明,不同蔬菜种类对营养液浓度要求有显著差异,不同蔬菜品种也表现出不同的生长特性。与0.5剂量营养液浓度相比,1.0剂量营养液浓度促进或保持生菜生长发育,显著降低生菜硝酸盐含量。0.5剂量营养液有利于小白菜生长,显著提高小白菜Vc含量,有效减少硝酸盐积累。供试的小白菜和生菜品种在不同浓度水培营养液下叶片数趋于一致。意大利奶油生菜叶部横径小于弘农生菜叶部横径,但根系明显长于弘农生菜根系。小白菜叶绿素含量显著高于生菜叶绿素含量。0.5剂量下意大利奶油生菜单株鲜重显著高于该浓度下的五月慢小白菜单株鲜重。小白菜Vc含量在不同浓度水培营养液下均显著高于生菜Vc含量。较低浓度营养液下四月慢小白菜的Vc含量最高,而较高浓度营养液更有利于五月慢小白菜Vc含量积累。  相似文献   

CO_2肥对保护地绿叶类蔬菜光合作用和产量形成的效应   总被引：1，自引：1，他引：1  

罗赣丰  梁小敏  周志宏  孙火喜 《江西农业学报》2007,19(7):71-73

采用施液态CO2法,研究了CO2肥对保护地绿叶蔬菜光合作用和产量形成的效应,结果表明,施CO2肥能极显著地增强其光合作用,促进其生长发育,达到极显著地增产。并总结了CO2肥施放的技术关键。  相似文献   

Effect of Partial Replacement of Nitrate by Amino Acid and Urea on Nitrate Content of Non-heading Chinese Cabbage and Lettuce in Hydroponic Condition   总被引：1，自引：0，他引：1  

CHEN Gui-lin  GAO Xiu-rui  ZHANG Xian-bin 《中国农业科学(英文版)》2002,1(4):444-449

In this paper, the authors studied the effect of different mixtures of glyeine (Gly), isoleucine (Iso), proline (Pro), and urea solutions used as a partial (20%) replacment of nitrate in the nitrate content and quality of non-heading Chinese cabbage and lettuce in hydroponice. Five treatments were done 12 d before harvest. Compared to the control group, Gly had the best effect in reducing the nitrate content of both vegetable leaves and petioles; the mixture of Giy, Iso and Pro ranked second and urea the least. Treatments with amino acid could also increase soluble sugar and protein contents and enhance total-N in leaves significantly.In contrast, amino acid enhanced NRA in non-heading Chinese cabbage, while they decreased it slightly in lettuce. The results showed that amino acids and urea could reduce the nitrate content of both vegetables, but they had almost the same effect on non-heading Chinese cabbage. Moreover, amino acids were more effective than urea in lettuce. As a result, it was concluded that partial replacement of nitrate with amino acids not only reduced the nitrate content but also improved the quality of vegetables.  相似文献   

Influence of growth conditions on the value of crisphead lettuce     

N. Poulsen  A. S. Johansen  J. N. Sørensen 《Plant foods for human nutrition (Dordrecht, Netherlands)》1995,47(2):157-162

Crisphead lettuce (Lactuca sativa L. varcapitata cvs.Marius andSaladin) were grown with a nitrogen supply from 50 to 200 kg N/hectare. Heads were stored for one or two weeks at 1 °C in cold storage or ice bank cooling. Samples were taken for measurement of dry matter, sugars, vitamin C and nitrate. The content of dry matter, sugars (glucose, fructose) and vitamin C decreased with increasing level of nitrogen, and the content of nitrate increased. Except for nitrate the contents of the other quality attributes decreased at all nitrogen supply levels during storage. No differences were found between the storage systems, and beside fructose no significant differences were found between the two cultivars. The content of dry matter, vitamin C, and nitrate decreased from the outer to the inner head fraction, while the content of sugars increased. Trimming decreased the content of dry matter, vitamin C and nitrate and increased the content of sugars. To obtain heads from storage with a relatively high content of dry matter, sugars and vitamin C, and a relatively low content of nitrate the nitrogen supply must be as low as possible. Except for nitrate where no distinct results were found in this experiment it must also be recommended to store the heads as short time as possible. Possibly the cv.Saladin has some advantage quality attributes after storage compared with the cv.Marius.  相似文献   

秸秆钾替代化肥钾对莴笋的营养效应研究   总被引：2，自引：0，他引：2  

谷守宽  袁婷  陈益  杨东  文娟  熊小莉  李戎  李振轮  王正银 《土壤》2017,49(4):699-705

在重庆地区多年种植蔬菜的两个基地进行田间试验,研究了秸秆钾替代化肥钾对莴笋的产量、品质、养分吸收量和钾素利用率的影响。秸秆钾替代化肥钾较无钾肥处理极显著提高两个试验点莴笋产量,增产11.4%~13.7%和11.4%~15.3%,各处理产量大小为:MH+KL(有机肥钾50%+化肥钾50%)MM+KM(有机肥钾30%+化肥钾70%)ML+KH(有机肥钾10%+化肥钾90%)CK2(常规施钾处理)CK1(无钾肥处理),以高量(50%)秸秆钾处理(MH+KL)增产作用最大。秸秆钾替代化肥钾较常规施钾提高莴笋产量,但增产作用不显著。两个试验点秸秆钾替代化肥钾显著降低莴笋叶维生素C和可溶性糖含量,降幅分别为4.7%~16.8%和3.2%~30.5%,但对莴笋茎该两个品质指标略有提高;莴笋叶硝酸盐含量增加8.0%~8.2%和11.4%~17.2%,莴笋茎硝酸盐含量在试验点1降低2.5%~11.5%,而试验点2则增加8.0%~13.5%。试验点1莴笋叶钙、镁、铁和锰含量为提高,试验点2降低。两个试验点秸秆钾替代化肥钾均显著提高莴笋对氮、磷和钾吸收量,以MH+KL处理莴笋钾素利用率最高。综合莴笋产量、品质、养分吸收和钾素利用效率,以MH+KL处理效果最佳。  相似文献   

基于氮元素循环利用的鱼粪生化处理工艺研究          下载免费PDF全文

张娟  韦秀丽  张凯  毕茹  曹建斌 《农业工程》2023,13(5)

为探究鱼菜共生系统中适宜氮元素高效循环利用的鱼粪生化处理工艺,设置厌氧和好氧两种工艺对鱼粪进行生化处理,每种工艺设置三个反应温度,三个鱼粪TS浓度,研究不同工艺处理后鱼粪液中氮元素变化规律以及鱼粪液对生菜生长的影响。结果表明,经厌氧处理后的鱼粪液铵硝比增大,经好氧处理后的鱼粪液铵硝比降至1.0以下,TS浓度3.0-3.5%的鱼粪经35.0℃好氧处理后水培生菜的生长速率最优,说明最适宜生菜生长的鱼粪生化处理工艺为：原鱼粪TS浓度3.0-3.5%,经35.0℃好氧工艺处理10天。  相似文献   

不同肥料组合对莴笋产量和品质的影响   总被引：16，自引：0，他引：16       下载免费PDF全文

狄彩霞  李会合  王正银  丁华平  黎小清  李清荣  向华辉  刘星 《土壤学报》2005,42(4):652-659

采用田间小区试验研究了不同肥料组合对莴笋产量、品质和叶片养分形态的影响。结果表明,在施入等量氮肥的基础上,磷、钾、中量及微量元素和有机肥料平衡施用使莴笋极显著增产(135·8%~177·0%),其增产序列依次为NP1K2MgZnB>NP2K2>NP1K2RM>NP1K2PP>NP1K2Mg>NP1K2>NP2K1。不同肥料组合可降低莴笋叶片硝酸盐含量,以NP1K2MgZnB处理降低量最大,降低最少者为NP2K2处理;茎中硝酸盐含量以NP1K2RM处理降低量最大,NP2K1处理降低最小。肥料组合各处理对莴笋营养品质Vc和氨基酸以提高作用为主,以NP1K2MgZnB处理对莴笋产量和品质的效应最好。莴笋叶片养分形态中,氮素以蛋白氮为主,磷素和钾素分别以非蛋白磷和非蛋白钾为主。不同肥料组合对莴笋叶片氮和磷素形态的效应不一致,对3种钾形态均有提高作用。各养分形态中,氮素仅非蛋白氮与茎硝酸盐呈显著负相关,与茎Vc呈显著正相关,与叶氨基酸呈极显著正相关;磷素以非蛋白磷与叶Vc、茎氨基酸呈显著负相关;钾素的非蛋白钾和全钾与叶硝酸盐呈显著负相关,与茎硝酸盐为极显著负相关,与叶Vc、茎Vc呈显著正相关,与茎氨基酸呈极著正相关,蛋白钾与茎硝酸盐呈极显著负相关,与叶Vc、茎Vc、茎氨基酸呈显著正相关,与叶氨基酸呈极著正相关。  相似文献